David Perkins has been granted 11 US patents while listed as an inventor at Active Power . The first was granted in 2001 and the most recent in March 2014. David Perkins ranks #435,149 of 4,157,543 US inventors in our database (top 10.5%). Patent records list David Perkins in Austin, TX, US.
Patents per Year Patents granted per year, 2001 to 2014 Bar chart with a peak of 3 patents in 2010. peak 3 2001: 1 patents 2001 2003: 2 patents 2003 2005: 1 patents 2005 2006: 1 patents 2006 2008: 1 patents 2008 2010: 3 patents 2010 2011: 1 patents 2011 2014: 1 patents 2014
Issued Patents All Time
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Showing 1–11 of 11 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
8671686 Systems and methods for providing backup energy to a load Joseph F. Pinkerton , David Beatty 2014-03-18
$624,000
7918091 Systems and methods for controlling humidity Joseph F. Pinkerton 2011-04-05
$4,129,000
7750518 Transient energy systems and methods for use of the same — 2010-07-06
$1,456,000
7693402 Thermal storage unit and methods for using the same to heat a fluid Robert S. Hudson , Donald M. Hudson , David Beatty , Donald Stamets , Joseph F. Pinkerton 2010-04-06
$1,409,000
7681395 Systems and methods for providing backup energy to a load Joseph F. Pinkerton , David Beatty 2010-03-23
7425807 Transient energy systems and methods for use of the same James A. Andrews , Scott D Logan , Karl Schuetze , David A. Badger , Robert S. Hudson 2008-09-16
$877,000
7127895 Systems and methods for providing backup energy to a load Joseph F. Pinkerton , David Beatty 2006-10-31
$2,110,000
6955050 Thermal storage unit and methods for using the same to heat a fluid Robert S. Hudson 2005-10-18
$2,863,000
6657320 Integrated flywheel uninterruptible power supply system James A. Andrews , David A. Badger , Robert L. Fuller, Jr. , Randal A. Lee , James R. Pitt +1 more 2003-12-02
$3,072,000
6642682 Circuits and methods for preheating a rotor of a motor-generator device Charles S. Richey 2003-11-04
$3,022,000
6208056 Cartridge armatures for electro-dynamic machines — 2001-03-27
$23,142,000